posted by Kelli .
solve the polynomial ineqaality. express the solution set in interval notation.
x^2(x+1) + 64(x+1) > 0
(x+1)(x^2 + 64) > 0
since x^2 + 64 is always positive
we just have to look at
x+1 > 0
x > -1
notice the graph is > 0 (above the x-axis) for all values of x , x >-1
The first graph looks like a straight line, but it isn't.
the scaling distorts the graph.